Lock washer



May G, 1933. Q G, OLSQN 1,909,475

Loox WASHER Filed Sept. 2, I1930 @MM/f WM Patented May 16, 1933 ,UNrrED l'si'.gfrlss CARL G. OLSON, 0F CHICAGO, ILLINOIS, ASSIGNOR TO SHAKEPROOF LOCK WASHER lCQM- PANY, QF CHICAGO, ILLINOIS, -A COBIORATION F DELAWARE LOCK WASHER Appueetien mea september s, 1930. semaine. 479,173.

k `My invention relates generally to lock Washers, and more particularly7 to lock washers which are adapted for use with wood screws and` the like. It is one of the primary objects of my invention to provide a Washer which is particularly applicable for use with wood screws and to this end I propose to employ a washer which is provided with teeth adapted to engage the head of a screw and also teeth which are adapted to imbed themselves Within the wood piece.

Another object of. my invention Yis to provide a conical lock washer having one set of teeth for lockingly engaging a com'- A panion conical screw head'. and another set of teeth for lockingly engaging the work piece. i

Still another object is to provide a lock washer, as above set forth, which is so arranged that when the same is clamped in' posltion upon `the work piece, the teeth whichlockingly enga e said work piece will be completely conceaIed.

A still further andimore specific object of my invention is to provide a-conical or countersunk type of lock washer having a plurality of internal teeth for lockingly' engaginga screw head, and a plurality of outer marginal teeth adapted to lockingly engage the work piecey so as to prevent ro tation of the lock Washer in either direction.

The above and numerous other objects and.

advantages will be moreapparent from the following detailed description when considered in connection with the accompanying drawing wherein: y v

Fig. 1 is a plan view of a lockwasher' construwcted in accordance with the teachings of my mvention; and f Figure 2 is a side elevational viewoffthe Washer of Figure 1.,

My present application relates generally to the subject matter set fortliin my copending application, Serial Number479,174, iledof "even date herewith wherein I have disclosed 'a dat type lock washer which is adaptable for use in connection with 'wood screws and the like.

Referring now to the drawing more in n detail wherein like numerals have been emp;

ployed to designate similar parts throughout the various ligures, 1t will be seen that' one embodiment of my invention contemplates a lock washer of the countersunk orconical type which includes a conical annular `body portion 10 having a plurality of internal spaced rongs or teeth 12 formed along the margin t ereof. These rongs are twisted out of the plane of the ody portion so -as toy provide work engaging teeth or corners on opposite sides of the washer for lockingly engaging a screw head (not shown). l

The outer margin of the body portion 10 `is formed with an annular flange 14 which is rolled loutwardly and downwardly. The

lower edge ofthis ange 14 is provided with are adapted, when imbedded within the workpiece, to prevent rotation Iof the washer in a counter-clockwise direction. Thus, itmight be stated that the ange 14. is provided with a-plurality of alternate, oppositely acting locking spurs which are adapted to imbed themselves Within the surface of the work, such as a ywood surfacef'and thereby prevent the washer from being 'rotated in either direction with respect to said surface.- Y

-By having the outer margin ofthe Washer i body vrolled in the Amanner shown and the teeth formed along the lower' edge thereof, said teeth'will become limbedded Within the Work surface without destroyingv orV in any way limpairing the'external appearance of the surface. In other words, my lock washer is particularly adaptable for use on the outside of furniture, woodwork in automobiles,4` and the like, because when the Washer is clamped in position against such surfaces, Vno unsightly external appearance is presented. In fact,`the rolled flange of the washer presents a very neat appearance along the outer margin of the screw head and the teeth are so constructed that they willimbed themselves within the work without crackinv or seriously injuring the surface thereo Thus, the teeth `or spurs 16 and 16a which extend in opposite directions with respect to the work piece, rmly anchor themselves within the surface of the work piece withoutsubjecting the same to crackrom the foregoing it will be apparent that my invention contemplates the provision of an improved lock washer construetion in which an annular body portion is provided with one set of teeth, namely the teeth or prongs 12, which are adapted to` lockingly engage the head of a screw with respect-to said work piece. My nvention has a Wide range of uses in view of the fact that it may be used in all instances Where it is desired to secure a Wood piece in position Without seriously impairing or in any way disfiguring the surface contour of the Work piece. That portion of the work piece which islockingly engaged by the teeth 16 and 16a is com letely concealed beneath the lange 14 and ,aid teeth are so constructed opposed teeth formed along t as to be particularlyfapplicable for use in connection with Wood surfaces.

Having thus described my invention, what ll claim as new and desire to secure by Letters Patent is:

' 1. A lock washer for use with conical head screws including a countersunk body f'portion of flat stock, a plurality of teeth formed along the inner margin of said body portion and warped out of the plane thereof for lockingly engaging a conical screw head, a rolled flange formed along the outer margin of said body portion, and a plurality of e edge of said rolled iange which are adapted to engage the outer surface of the Work iece for securing the washer againstrotatlon with respect thereto.

2. A lock washer including an' annular body portion of flat stock, a plurality of wor engaging teeth positioned along a margin ofsaid body portion jor lockingly engaging a screw head, a plurality of teeth 'l positioned along the other margin of said body portion and inclined so as to lockingly engage vthe Work piece at a point spaced from the screw head, and a plurality of teeth positioned along said last mentioned margin which are oppositely inclined with respect to the other teeth on said margin for' lockingly engaging said work piece.

3. A lock washer including a conical annular'body portion, a pluralityl of twisted teeth extending from the smaller periphery thereof tor engaging the head' of a screw, a rolled flange formed along the outer 4mar in of said body portion, and a plurality o alterscribed my name.

CARL G. OLSON. 

